[nrf fromtree] tests uart_pm: Enable for nrf54l15bsim

Enable this test in the simulated nrf5340 and provide
an appropriate overlay.

Signed-off-by: Alberto Escolar Piedras <[email protected]>
(cherry picked from commit 9c386ca)

Signed-off-by: Sebastian Głąb <[email protected]>

Author: nordic-segl

tests/drivers/uart/uart_pm/boards/nrf54l15bsim_nrf54l15_cpuapp.overlay

@@ -0,0 +1,3 @@
+/* SPDX-License-Identifier: Apache-2.0 */
+
+#include "nrf54l15dk_nrf54l15_cpuapp.overlay"

tests/drivers/uart/uart_pm/testcase.yaml

@@ -6,6 +6,7 @@ common:
   platform_allow:
     - nrf52840dk/nrf52840
     - nrf54l15dk/nrf54l15/cpuapp
+    - nrf54l15bsim/nrf54l15/cpuapp
     - nrf54h20dk/nrf54h20/cpuapp
     - nrf52_bsim
     - nrf5340bsim/nrf5340/cpuapp
@@ -29,6 +30,7 @@ tests:
     extra_args: DTC_OVERLAY_FILE="boards/nrf52840dk_nrf52840.overlay;nrf_rx_disable.overlay"
     platform_exclude:
       - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54l15bsim/nrf54l15/cpuapp
       - nrf54h20dk/nrf54h20/cpuapp
 
   drivers.uart.pm.enhanced_poll: